CN114607597A

CN114607597A - Rotor shaft assembly in vacuum pump

Info

Publication number: CN114607597A
Application number: CN202011408753.8A
Authority: CN
Inventors: 王光玉; 刘志东; 毕德龙; 秦柏林; 麻方宇; 王璟
Original assignee: Sky Development Co ltd Chinese Academy Of Sciences
Current assignee: Sky Development Co ltd Chinese Academy Of Sciences
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2022-06-10

Abstract

The invention belongs to the technical field of vacuum pumps, and particularly relates to a rotor shaft assembly in a vacuum pump. The multi-stage driving mechanism comprises a driving shaft, a multi-stage driving rotor, a driven shaft and a multi-stage driven rotor, wherein the driving shaft is provided with the multi-stage driving rotor, and all the driving rotors except the one-stage driving rotor in the multi-stage driving rotor are connected with the driving shaft through a key I; and the driven shaft is provided with a plurality of stages of driven rotors, and the other driven rotors except the one-stage driven rotor in the plurality of stages of driven rotors are connected with the driven shaft through a key II. The invention adopts keys to position the rotors at all levels, the other ends of the keys are arranged on the driving shaft or the driven shaft, and the rotors and the shaft sleeve adopt a split type, thereby having simple processing and convenient replacement.

Description

Rotor shaft assembly in vacuum pump

Technical Field

The invention belongs to the technical field of vacuum pumps, and particularly relates to a rotor shaft assembly in a vacuum pump.

Background

In the existing vacuum pump, a lug or groove structure is adopted between a rotor component and a driving shaft to form rotation positioning so as to realize torque transmission, the rotor or the driving shaft is complex to process and not easy to ensure design requirements, and when one rotor breaks down, the adjacent rotor often breaks down. Axial positioning is formed between the rotor and the end face of the rotor of the driving shaft and between the end faces of the rotors, and the shaft sleeve and the rotor are integrated, so that the axial size of the rotor is increased, the processing becomes difficult, and the design requirement is not favorably ensured.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a rotor shaft assembly in a vacuum pump, which aims to solve the problems of large axial size and difficult processing of the existing rotor.

In order to achieve the purpose, the invention adopts the following technical scheme:

a vacuum pump inner rotor shaft assembly comprises a driving shaft, a multi-stage driving rotor, a driven shaft and a multi-stage driven rotor, wherein the driving shaft is provided with the multi-stage driving rotor, and all the other driving rotors except the one-stage driving rotor in the multi-stage driving rotor are connected with the driving shaft through a key I;

and the driven shaft is provided with a plurality of stages of driven rotors, and the other driven rotors except the one-stage driven rotor in the plurality of stages of driven rotors are connected with the driven shaft through a key II.

And all stages of driving rotors behind the two-stage driving rotor in the multi-stage driving rotor are axially positioned through the driving shaft sleeve.

And the driven rotors at all stages behind the two-stage driven rotor in the multi-stage driven rotor are axially positioned through driven shaft sleeves.

The other driving rotors at all levels except the driving rotor at one level are connected with the driving shaft through one or two keys I.

The other driven rotors at all stages except the driven rotor at one stage are connected with the driven shaft through one or two keys II.

And a first-stage driving rotor in the multi-stage driving rotors and the driving shaft are of an integrated structure or a split structure.

And one-stage driven rotor in the multi-stage driven rotors and the driven shaft are of an integrated structure or a split structure.

The driving shaft is connected with an external motor through a motor connecting key.

The invention has the advantages and beneficial effects that: the rotor shaft assembly in the vacuum pump provided by the invention adopts keys to position each stage of rotor, the other end of each key is arranged on the driving shaft or the driven shaft, and the rotors and the shaft sleeves are split, so that the processing is simple and the replacement is convenient.

Drawings

FIG. 1 is an isometric view of a rotor shaft assembly within a vacuum pump of the present invention;

FIG. 2 is a cross-sectional view of a rotor shaft assembly within a vacuum pump of the present invention.

In the figure: 11 is the driving shaft, 12 is five-stage initiative rotor, 13 is the level four initiative rotor, 14 is three-stage initiative rotor, 15 is the initiative axle sleeve, 16 is the second grade initiative rotor, 17 is the first grade initiative rotor, 18 is the motor connecting key, 19 is key I, 21 is the driven shaft, 22 is five-stage driven rotor, 23 is the level four driven rotor, 24 is three-stage driven rotor, 25 is the driven axle sleeve, 26 is the second grade driven rotor, 27 is the first grade driven rotor, 28 is key II.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-2, the rotor shaft assembly in the vacuum pump provided by the present invention comprises a driving shaft 11, a multi-stage driving rotor, a driven shaft 21 and a multi-stage driven rotor, wherein the driving shaft 11 is provided with the multi-stage driving rotor, and the other driving rotors of all stages except the driving rotor 17 of one stage in the multi-stage driving rotor are connected with the driving shaft 11 through a key i 19; the driven shaft 21 is provided with a plurality of stages of driven rotors, and the other driven rotors of the plurality of stages of driven rotors except the one-stage driven rotor 27 are connected with the driven shaft 21 through keys II 28.

In the embodiment of the invention, the driving shaft 11 is connected with an external motor through a motor connecting key 18 to transmit torque.

On the basis of the above embodiment, the driving rotors of each stage behind the driving rotor 16 of the second stage in the multi-stage driving rotor are axially positioned by the driving shaft sleeve 15. The driven rotors of the stages behind the driven rotor 26 of the second stage in the multi-stage driven rotor are axially positioned by the driven shaft sleeve 25.

Furthermore, the other driving rotors at all stages except the driving rotor 17 at one stage are connected with the driving shaft 11 through one or two keys I19, so that the angular positioning between the driving rotors and the driving shaft 11 is realized. When connected through two keys I19, the two keys I19 are symmetrically arranged on two sides of the driving shaft 11.

Furthermore, the other driven rotors of all the stages except the driven rotor 27 of one stage are connected with the driven shaft 21 through one or two keys II 28, so that the angular positioning between the driven rotors and the driven shaft 21 is realized.

In this embodiment, the first-stage driving rotor 17 of the multi-stage driving rotors is of an integral structure or a split structure with the driving shaft 11, and the first-stage driven rotor 27 of the multi-stage driven rotors is of an integral structure or a split structure with the driven shaft 21.

As shown in fig. 1-2, in the embodiment of the present invention, a five-stage driving rotor is disposed on the driving shaft 11, and specifically includes a first-stage driving rotor 17, a second-stage driving rotor 16, a third-stage driving rotor 14, a fourth-stage driving rotor 13, and a fifth-stage driving rotor 12, wherein the second-stage driving rotor 16, the third-stage driving rotor 14, the fourth-stage driving rotor 13, and the fifth-stage driving rotor 12 are connected to the driving shaft 11 through a key i 19 to form a rotational positioning. The driving shaft 11, the driving rotor and the driving shaft sleeve 15 are positioned by the axial end surface in the axial direction, and the driving shaft sleeve is arranged between the driving rotors at all levels.

The driving shaft 11 transmits torque to the driven shaft 21 through a gear, and the number of the driven rotor stages is the same as that of the driving rotor stages, and the driven rotor stages and the driving rotor stages appear in pairs and rotate synchronously. And a five-stage driven rotor is arranged on the driven shaft, and specifically comprises a first-stage driven rotor 27, a second-stage driven rotor 26, a third-stage driven rotor 24, a fourth-stage driven rotor 23 and a five-stage driven rotor 22, wherein the second-stage driven rotor 26, the third-stage driven rotor 24, the fourth-stage driven rotor 23 and the five-stage driven rotor 22 are connected with the driven shaft 21 through a key II 28 to form rotary positioning. The driven shaft 21, the driven rotors and the driven shaft sleeve 25 are positioned by axial end faces in the axial direction, and the driven shaft sleeve 25 is installed between the driven rotors at different levels.

The invention adopts keys to position the rotors at all levels, the other ends of the keys are arranged on the driving shaft or the driven shaft, and the rotors and the shaft sleeve adopt a split type, thereby having simple processing and convenient replacement.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, extension, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A vacuum pump inner rotor shaft assembly is characterized by comprising a driving shaft (11), a multi-stage driving rotor, a driven shaft (21) and a multi-stage driven rotor, wherein the driving shaft (11) is provided with the multi-stage driving rotor, and all the other driving rotors except a first-stage driving rotor (17) in the multi-stage driving rotor are connected with the driving shaft (11) through a key I (19);

and a multi-stage driven rotor is arranged on the driven shaft (21), and the other driven rotors of all stages except the one-stage driven rotor (27) in the multi-stage driven rotor are connected with the driven shaft (21) through a key II (28).

2. A vacuum pump inner rotor shaft assembly according to claim 1, wherein each stage of the multi-stage active rotor following the two stage active rotor (16) is axially positioned by an active bushing (15).

3. The rotor-shaft assembly within a vacuum pump according to claim 1, wherein the driven rotors of each stage following the driven rotor (26) of the second stage are axially positioned by a driven bushing (25) therebetween.

4. A vacuum pump inner rotor shaft assembly according to claim 1, wherein each of the other active rotors except the one-stage active rotor (17) is connected to the driving shaft (11) through one or two of the keys i (19).

5. The vacuum pump inner rotor shaft assembly according to claim 1, wherein the driven rotors of the respective stages other than the driven rotor (27) of the one stage are connected to the driven shaft (21) through one or two keys ii (28).

6. The rotor shaft assembly in a vacuum pump according to claim 1, wherein a primary driving rotor (17) of the multi-stage driving rotors is of an integral structure or a separate structure from the driving shaft (11).

7. The vacuum pump inner rotor shaft assembly according to claim 1, wherein one of the plurality of stages of driven rotors (27) is of an integral structure or a separate structure from the driven shaft (21).

8. A vacuum pump inner rotor shaft assembly according to claim 1, wherein the drive shaft (11) is connected to an external motor by a motor connection key (18).